Single Vs Double Expanding Gate Valve

Bel valves through conduit expanding gate valve enables double block and bleed dbb functionality to be achieved within one single valve assembly as opposed to the two conventional slab gates that would otherwise be required.

Single vs double expanding gate valve.

Valvesgate expanding through conduit gate valves 610 917 952 953 928 03 operation the double expanding gate valve is equipped with a two segment gate. Our patented single loaded spring sls stem seal design used in saf t seal slab gate valves and wkm pow r seal double expanding gate valves provides superior leak protection and a self adjusting seal designed to reduce maintenance. Adopts an environmental health and safety. Consisting of a gate and a second segment male and female wedge segment.

Construction is available with single expanding or double expanding system. For example in liquid service near waterways or municipalities double expanding gate valves with dbb capabilities such as the cameron wkm pow r seal double expanding gate valve are preferred for critical isolation because they provide a tight mechanical seal simultaneously upstream and downstream which is normally unaffected by pressure. Slab double expanding single expanding. Each segment is machined with a double slope a male and a female.

The production of through conduit gate valves is a part of our core business. Each of these versions are fully internally engineered sizes covered. Double expanding gate valves are made by two sliding pieces. In the first case the two halves of the gate are pushed against the seats in the valve closed position by having an internal stop acting on one of the two halves.

The gate female wedge is driven by the stem and a centralizer mechanism guide helps in retaining the gate segment assembly until sealing through expansion is required. But solid slab valves as the one shown in figure 6 is normally not accepted as a double isolation valve. Double expanding gate valves illustrated in figure 5 are accepted as double block bleed valves and are used as a single valve with double isolation. This has to do with psychology if you don t know how the valves actually work you feel.

Gate valves are designed with a sealing unit to provide a tight seal around the stem. Complete single source integrated solution for manual or actuated high integrity ball check slab gate double expanding gate and axial flow valves in both subsea and topside environments. 1 to 56 for api 6d and 1 13 16 to 13 5 8 for api 6a. The slopes are designed to cause the expansion of the gate in both open and closed positions.